Chemical composition: FeO31.03, Fe2O368.96. Among them, the isomorphism of Fe3 is replaced by Al3, Ti4, Cr3, V3, etc.; instead of Fe2, there are Mg2, Mn2, Zn2, Ni2, Co2, Cu2, Ge2 and the like. When Ti4 replaces Fe3, it is accompanied by Fe2-Fe3, Mg2-Fe2 and V3.
Magnetite-Fe3; Ti can also exist in the form of a continuous inclusion of fine inclusions of ilmenite or ilmenite, which is formed by solid solution dissolution. At >600 °C, the complete solid solution of magnetite FeFe2O4-Fe2TiO4 is formed. The mineral structure is: Fe3[Fe21-xFe31-2xTi4x]O4(0≤x≤0.2); Fe31.2-xFe2x-0.2[Fe21.2Fe30.8- xTi4x]O4 (0.2≤x≤0.8); Fe32-2xFe22x-1[Fe22-xTi4x]O4 (0.8≤x≤1); wherein the cations in square brackets are octahedral coordination. At >500 °C, a complete solid solution of FeFe2O4-FeTiO3 is formed; as the temperature decreases, the solid solution dissolves.
When Ti4 replaces Fe3, TiO2 is called titanium magnetite at 25%, and TiO2 is called titanomagnetite at 25%. When there is more vanadium-containing titanium, it is called vanadium-titanium magnetite. Chromium-bearing is called chrome magnetite. Titanium magnetite and vanadium-titanium magnetite form a solid solution at high temperature, and dissolve when the temperature drops. In the light sheet, microscopic orientation of ilmenite formed in magnetite grains can be seen along the magnetic field. The octahedral splitting distribution of iron ore is called ferrotitanium magnetite. Fe2 in magnetite can be replaced by Mg2 to form a complete series of magnetite-magnesium ore.
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